﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using static System.Windows.Forms.VisualStyles.VisualStyleElement;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {

        }

        private void Form1_Load(object sender, EventArgs e)
        {
            comboBox1.Items.Add("+");
            comboBox1.Items.Add("-");
            comboBox1.Items.Add("*");
            comboBox1.Items.Add("/");
            comboBox1.SelectedIndex = 0;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int result = 0;
            int n1 = int.Parse(textBox1.Text);
            int n2 = int.Parse(textBox2.Text);
            string s = comboBox1.SelectedItem.ToString();
            if (s == "+") { result = n1 + n2; }
            else if (s == "-") { result = n1 - n2; }
            else if (s == "*") { result = n1 * n2; }
            else if (s == "/") { result = n1 / n2; }
            else { result = n1 + n2; }
            label1.Text = result.ToString();
        }
    }
}
